At 3:32 PDT on 8/19/07 near Edgewater Boulevard and East Hillsdale Boulevard I was on the walking path headed east with Max, a leashed dog I was walking. There was a loud propeller airplane, a unique design that had wings in the rear of the fuselage, probably flying out of San Carlos airport. I looked at the plane and noticed a stationary flickering speck in the sky. Foster City is the approach to SFO, and there is no way what I saw was a commercial aircraft. It was a stationary flickering. The weather condition was brilliant sunlight facing the object, a quarter moon visible, clear blue sky. I pointed to the object and mentioned to an elderly male and female couple with a small white leashed dog to look, and had a line of sight to the object, they mentioned it must be the plane that flew overhead seconds earlier, they made no effort to locate the object.